Regenerative engine device

• US 10,273,856 B2
• Filed: 09/20/2016
• Issued: 04/30/2019
• Est. Priority Date: 03/25/2014
• Status: Active Grant

• Current Assignee: Yanmar Power Technology Co., Ltd. (Yanmar Holdings Co., Ltd.)
• Original Assignee: Yanmar Company Limited (Yanmar Holdings Co., Ltd.)
• Inventors: Shiomi, Hideo, Hori, Taiki
• Primary Examiner(s): Bradley, Audrey K
• Assistant Examiner(s): Delgado, Anthony Ayala
• Application Number:
  US15/270,516
• Publication Number:
  US 20170009634A1
• Time in Patent Office: 952 Days
• CPC Class Codes: E02F 9/2066 of the type combustion engines
• CPC Class Codes: E02F 9/268 with failure correction follow-up actions
• CPC Class Codes: F01N 2430/00 Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
• CPC Class Codes: F01N 3/023 using means for regenerating the filters, e.g. by burning trapped particles by electrically controlling the supply of combustible mixture or its constituents only F02D41/0235
• CPC Class Codes: F01N 9/002 of filter regeneration, e.g. detection of clogging
• CPC Class Codes: F02D 2041/228 Warning displays
• CPC Class Codes: F02D 2200/0812 Particle filter loading
• CPC Class Codes: F02D 2200/604 Engine control mode selected by driver, e.g. to manually start particle filter regeneration or to select driving style
• CPC Class Codes: F02D 31/007 controlling fuel supply
• CPC Class Codes: F02D 41/0235 in relation with the state of the exhaust gas treating apparatus control of exhaust gas treating apparatus per se F01N
• CPC Class Codes: F02D 41/0245 by increasing temperature of the exhaust gas leaving the engine
• CPC Class Codes: F02D 41/025 by changing the composition of the exhaust gas, e.g. for exothermic reaction on exhaust gas treating apparatus
• CPC Class Codes: F02D 41/029 the exhaust gas treating apparatus being a particulate filter
• CPC Class Codes: F02D 41/402 Multiple injections
• CPC Class Codes: F02D 41/405 with post injections
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

An engine device includes an engine, an exhaust gas purification device arranged on an exhaust path of the engine, and an engine control device that controls drive of the engine. The engine control device executes a plurality of regeneration controls with which particulate matter accumulated in the exhaust gas purification device is combusted and removed. As the plurality of regeneration controls, at least non-work regeneration control, in which an exhaust gas temperature is raised in combination of post-injection and a predetermined high rotational speed, is included. The engine control device drives the engine so as to solely combust and remove the particulate matter in the non-work regeneration control and compulsorily executes isochronous control in which a rotational speed of the engine is maintained constant, irrespective of variation in load of the engine.

Claims

1. An engine device comprising:

an engine,

an exhaust gas purification device arranged on an exhaust path of the engine, and

an engine controller configured to control a drive of the engine and configured to execute at least one regeneration control to combust and remove particulate matter accumulated in the exhaust gas purification device,

wherein the at least one regeneration control comprises a non-work regeneration control, in which an exhaust gas temperature is raised with the post-injection of fuel into the exhaust gas purification device and with the running of the engine at a predetermined high rotational speed, and

wherein the engine controller is configured to;

drive the engine to solely combust and remove the particulate matter in the non-work regeneration control, and

compulsorily execute isochronous control in which a rotational speed of the engine is maintained constant, irrespective of variation in load of the engine, to run the engine at the predetermined high rotational speed,

wherein the non-work regeneration control comprises at least a stationary regeneration control that is executable when regeneration control fails during continuous work, and recovery regeneration control that is executable when the stationary regeneration control fails, and

wherein when the engine controller executes any of the stationary regeneration control or the recovery regeneration control, the engine controller executes said compulsory execution of said isochronous control.

2. The engine device according to claim 1,

wherein the engine controller is configured to alternately select execution of high idle limit mode, in which the rotational speed of the engine is limited to a limit value of a high idle rotational speed, and release of the high idle limit mode, and

wherein, during execution of the non-work regeneration control, the high idle limit mode is compulsorily released, and the engine is driven at the predetermined high rotational speed that is higher than the limit value of the high idle rotational speed.

3. The engine device according to claim 1,

wherein, during execution of the non-work regeneration control, the engine controller limits output of the engine to a non-work maximum output that is lower than a maximum output and drives the engine accordingly.

4. The engine device according to claim 1,

wherein the engine controller is configured to store an output characteristic map having a relation of the rotational speed and a torque of the engine, and

wherein the engine controller is configured such that during execution of a high idle limit mode, after the engine controller corrects the output characteristic map based on a limit value of a high idle rotational speed, the engine controller calculates a target fuel injection amount based on the corrected output characteristic map and drives the engine accordingly.

5. The engine device according to claim 1, wherein the engine controller is configured to be mounted on a work vehicle.

6. The engine device according to claim 5, wherein the predetermined high rotation speed is a parking maximum output in which operating portions of the work vehicle are not driven.

7. The engine device according to claim 1, wherein the recovery regeneration control reduces the fuel injection amount of the post-injection compared with the stationary regeneration control.

8. An engine device comprising:

an engine;

an exhaust gas purification device arranged on an exhaust path of the engine; and

an engine controller configured to control a drive of the engine and configured to execute at least one regeneration control to combust and remove particulate matter accumulated in the exhaust gas purification device;

wherein the at least one regeneration control comprises a non-work regeneration control, in which an exhaust gas temperature is raised with the post-injection of fuel into the exhaust gas purification device and with the running of the engine at a predetermined high rotational speed;

wherein the engine controller is configured to;

drive the engine to solely combust and remove the particulate matter in the non-work regeneration control; and

compulsorily execute isochronous control in which a rotational speed of the engine is maintained constant, irrespective of variation in load of the engine, to run the engine at the predetermined high rotational speed;

wherein the engine controller is configured to alternately select execution of high idle limit mode, in which the rotational speed of the engine is limited to a limit value of a high idle rotational speed, and release of the high idle limit mode; and

wherein, during execution of the non-work regeneration control, the high idle limit mode is compulsorily released, and the engine is driven at the predetermined high rotational speed that is higher than the limit value of the high idle rotational speed.

9. The engine device according to claim 8, wherein, during execution of the non-work regeneration control, the engine controller limits output of the engine to a non-work maximum output that is lower than a maximum output and drives the engine accordingly.

10. An engine device comprising:

an engine;

an exhaust gas purification device arranged on an exhaust path of the engine; and

an engine controller configured to control a drive of the engine and configured to execute at least one regeneration control to combust and remove particulate matter accumulated in the exhaust gas purification device;

wherein the at least one regeneration control comprises a non-work regeneration control, in which an exhaust gas temperature is raised with the post-injection of fuel into the exhaust gas purification device and with the running of the engine at a predetermined high rotational speed;

wherein the engine controller is configured to;

drive the engine to solely combust and remove the particulate matter in the non-work regeneration control; and

compulsorily execute isochronous control in which a rotational speed of the engine is maintained constant, irrespective of variation in load of the engine, to run the engine at the predetermined high rotational speed;

wherein the engine controller is configured to store an output characteristic map having a relation of the rotational speed and a torque of the engine; and

wherein the engine controller is configured such that during execution of a high idle limit mode, after the engine controller corrects the output characteristic map based on a limit value of a high idle rotational speed, the engine controller calculates a target fuel injection amount based on the corrected output characteristic map and drives the engine accordingly.